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Please note: This article provides technical advice about how to investigate the owner of a phone number. This is not intended to be a substitute for or an attempt to provide relationship or marriage advice. Please speak to a trained and licensed counselor or professional before engaging in any kind of investigation on your spouse or significant other.

If you've noticed some strange or unfamiliar phone numbers showing up in your significant other's phone call history -- or if you have any other reason for concern -- you will be able to discover the source of the mysterious phone number by following these steps. This strategy should help you uncover the person's name, address and other information.

Step 1: Start In Your Own Backyard

Very often, unknown phone numbers are just a friend, family member or colleague -- especially if the number is coming from a new cell phone or work number that you weren't aware of. Therefore it's always best to discount this possibility as soon as possible.

Begin by looking through your partner's address books -- both on their cell phone and in their day-planner, or any other kind of organization tool they might use.

Next, search through their computer or any other computer they might have access to. We recommend using Google Desktop for this purpose. It's very fast and comprehensive, as well as completely free. Search through their emails also, and any other related social or contact programs.

Also look inside the pockets of their clothing, wallet, and so on for pieces of paper.

Step 2: Evaluate The Behavior Of Your Partner

Does he or she arrive home at later than normal times?

Is he or she at work much more often than usual, or going on frequent business trips during the weekends and such?

Has the communication with your partner deteriorated to the point where your overall relationship feels "distant" or "forced"?

If that's the case, there might well be cause for concern. These mysterious phone calls may indicate an ongoing or new love affair.

(To find out if you're reading these signs correctly, try reading "How to Catch a Cheating Spouse" which is highly recommended by a variety of relationship advice specialists.)

Step 3: Find Out For Certain By Conducting a Reverse Phone Look Up

First, perform a reverse search on the phone number by using Switchboard.com and WhitePages.com (if it's a Canadian number, use WhitePages.ca). If the number turns out to be a listed residential number, you will probably find it in that database (those free sites all use the same database).

Next, follow the instructions included in the article below for more advice on how to conduct free reverse cell phone searches on the web:

Third, if that doesn't work, then you'll need to see if the number is included in our provider's premium database. Run your initial search for free. To begin your reverse cell phone number lookup, click here >>

For further information about finding out if your partner is cheating, click on the banner below:

Disclaimer: Reverse Phone Detective does NOT buy, sell, rent, or distribute phone records or call logs under any circumstances. By conducting a search, you agree to use our information only for appropriate, legal purposes, and in compliance with all applicable federal, state and local laws and regulations, as outlined in theEnd User Agreement.